Fix detector URL and advisory handling

Recover joined URL arguments without splitting local paths, derive advisory behavior from registry severity across consumers, inspect readable linked CSS in URL scans, and report only the dominant primary font.

AI assistance disclosure: Implemented and verified with Codex under maintainer direction.

cli/engine/browser/injected/index.mjs

@@ -1235,7 +1235,7 @@ if (IS_BROWSER) {
           // Advisory findings (em-dash overuse, etc.) are surfaced but never
           // treated as failures; carry the flag so the overlay/extension can
           // render them with the mildest affordance and consumers can filter.
-          advisory: (ap && ap.advisory === true) || f.advisory === true,
+          advisory: ap?.severity === 'advisory' || f.severity === 'advisory' || f.advisory === true,
           detail: f.detail || f.snippet,
           ignoreValue: f.ignoreValue || f.value || '',
           name: ap ? ap.name : (f.type || f.id),
@@ -1277,6 +1277,36 @@ if (IS_BROWSER) {
     else groupMap.set(el, [...kept]);
   }
 
+  // Read CSS that is absent from document.outerHTML. Inline <style> blocks are
+  // already present in the HTML pattern corpus, so limit this walk to linked
+  // stylesheets. Same-origin CSS and readable CORS sheets participate; browser
+  // security exceptions for cross-origin sheets are expected and skipped.
+  function linkedStylesheetText() {
+    const parts = [];
+    const seen = new Set();
+    const appendSheet = (sheet) => {
+      if (!sheet || seen.has(sheet)) return;
+      seen.add(sheet);
+      let rules;
+      try { rules = Array.from(sheet.cssRules || sheet.rules || []); }
+      catch { return; }
+      for (const rule of rules) {
+        if (rule.styleSheet) appendSheet(rule.styleSheet);
+        else if (rule.cssText) parts.push(rule.cssText);
+      }
+    };
+    let sheets;
+    try { sheets = Array.from(document.styleSheets || []); }
+    catch { return ''; }
+    for (const sheet of sheets) {
+      const owner = sheet.ownerNode;
+      if (owner?.tagName?.toLowerCase() !== 'link') continue;
+      if (!/\bstylesheet\b/i.test(owner.getAttribute?.('rel') || '')) continue;
+      appendSheet(sheet);
+    }
+    return parts.join('\n');
+  }
+
   function browserFindingsFromMap(groupMap) {
     return [...groupMap.entries()].map(([el, findings]) => ({ el, findings }));
   }
@@ -1650,7 +1680,11 @@ if (IS_BROWSER) {
     // (the CSS ships here, but the pattern never renders — the live DOM is
     // ground truth in the browser), and a match under a data-impeccable-ignore
     // ancestor is waived. Selector-less findings stay page-level.
-    const scopedHtmlFindings = checkHtmlPatterns(docClone.outerHTML).filter(f => {
+    const html = docClone.outerHTML;
+    const corpora = buildHtmlPatternCorpora(html);
+    const linkedCss = linkedStylesheetText();
+    if (linkedCss) corpora.styleText += `\n${linkedCss}`;
+    const scopedHtmlFindings = checkHtmlPatterns(html, corpora).filter(f => {
       if (!f.selector) return true;
       const query = String(f.selector).replace(/::?[a-zA-Z-]+(\([^)]*\))?/g, '').trim().replace(/,\s*(?=,|$)/g, '');
       if (!query || /^[,\s]*$/.test(query)) return true;